APT installation of mypaint crashes in Kubuntu 24.04

[archisman-panigrahi]

Description of bug

Mypaint (installed from apt) crashes as soon as I draw on it (either with mouse or touch screen). I am running Kubuntu 24.04 with Wayland. Also crashes when run with the env variable GDK_BACKEND=x11.

Somehow, the appimage does not have the issue.

Steps to reproduce

1. Install mypaint with sudo apt install mypaint in Kubuntu 24.04 (issue may be present on regular Ubuntu 24.04 too).
2. Try to draw something
3. Mypaint crashes as soon as the first scratch is made.

Backtraces or error messages

$ mypaint
INFO: mypaint: Installation layout: conventional POSIX-like structure with prefix '/usr'
INFO: gui.main: No locale setting found, using system locale
INFO: lib.i18n: POSIX: LANG='en_US.UTF-8'
INFO: lib.i18n: POSIX: LANGUAGE=''
INFO: lib.i18n: Value of LANGUAGE after cleanup: ''
INFO: gui.compatibility: Setting mode to 2.x (standard)
INFO: gui.compatibility: Setting default layer type to Pigment
INFO: gui.device: New device 'Wayland Pointer' (GDK_SOURCE_MOUSE, axes:2, class=GdkWaylandDevice, vendor=None, product=None)
INFO: gui.device: New device 'Wayland Touch' (GDK_SOURCE_TOUCHSCREEN, axes:2, class=GdkWaylandDevice, vendor=None, product=None)
INFO: gui.document: Initialized background from '/usr/share/mypaint/backgrounds/mrmamurk/mamurk_e_1.png'
WARNING: gui.keyboard: Ignoring keybinding for '<Actions>/BrushModifierActions/BlendModeMenu'
INFO: gui.brushmanager: Switching default pigment setting to On
INFO: lib.document: load_ora: '/home/archisman/.local/share/mypaint/scratchpads/autosave.ora'
INFO: lib.document: 0.068s load_ora total
INFO: gui.filehandling: Loaded scratchpad from '/home/archisman/.local/share/mypaint/scratchpads/autosave.ora'
INFO: gui.compatibility: Setting default layer type to Pigment
Segmentation fault

### MyPaint version

2.0.1+gitexport.478280f

### Operating System(s)

Kubuntu 24.04

### Desktop Environment (Linux)

KDE Running Wayland

### Code of Conduct

- [X] I acknowledge that my conduct contributes to shaping the community.

[gripfastistech]

Can confirm, ubunutu mate 24.04 too.

Would prefer apt install also.

Side note: Flatpak tested ok but flatpak sandboxing (eg no external editing is deal breaker). Flatseal does not have portal or permission workaround for that alternative.

[jtojnar]

Hi, could you please provide a stack trace?

1. Get the crash process ID using coredumpctl
2. Run coredumpctl gdb process-ID
3. In the prompt, enter bt full

You will need gdb installed and for best info also install debug symbols. For the latter, it should be sufficient to set the following environment variable before running coredumpctl gdb and gdb will download the necessary symbols:

export DEBUGINFOD_URLS="https://debuginfod.ubuntu.com"

[gripfastistech]

un 2024-05-26 11:25:24 PDT 4917 1000 1000 SIGSEGV present      /usr/bin/python3.12              13.3M

Message: Process 4917 (mypaint) of user 1000 dumped core.
                
                Module libzstd.so.1 from deb libzstd-1.5.5+dfsg2-2build1.amd64
                Module libsystemd.so.0 from deb systemd-255.4-1ubuntu8.amd64
                Stack trace of thread 4935:
                #0  0x0000000000586be6 PyObject_Malloc (python3.12 + 0x186be6)
                #1  0x00000000005a6d02 n/a (python3.12 + 0x1a6d02)
                #2  0x000000000058522e PyObject_GetAttrString (python3.12 + 0x18522e)
                #3  0x000000000054c02f _PyObject_CallMethod_SizeT (python3.12 + 0x14c02f)
                #4  0x000074f3b5e90db1 n/a (_mypaintlib.cpython-312-x86_64-linux-gnu.so + 0x27db1)
                #5  0x000074f3b5e44f3e process_tile_internal (libmypaint-1.5.so.1 + 0x14f3e)
                #6  0x000074f3b5e4547b n/a (libmypaint-1.5.so.1 + 0x1547b)
                #7  0x000074f3b5d98cde n/a (libgomp.so.1 + 0x21cde)
                #8  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #9  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4917:
                #0  0x000074f3b5d9bc6a n/a (libgomp.so.1 + 0x24c6a)
                #1  0x000074f3b5d9a6ed n/a (libgomp.so.1 + 0x236ed)
                #2  0x000074f3b5e40c8d mypaint_tiled_surface2_end_atomic (libmypaint-1.5.so.1 + 0x10c8d)
                #3  0x000074f3b5eb29f0 n/a (_mypaintlib.cpython-312-x86_64-linux-gnu.so + 0x499f0)
                #4  0x00000000005d7f0d _PyEval_EvalFrameDefault (python3.12 + 0x1d7f0d)
                #5  0x000000000054caad n/a (python3.12 + 0x14caad)
                #6  0x000074f3b774e7f2 n/a (_gi.cpython-312-x86_64-linux-gnu.so + 0x2f7f2)
                #7  0x000074f3b81ac641 n/a (libffi.so.8 + 0x7641)
                #8  0x000074f3b81acd38 n/a (libffi.so.8 + 0x7d38)
                #9  0x000074f3b701448e n/a (libglib-2.0.so.0 + 0x5d48e)
                #10 0x000074f3b7073717 n/a (libglib-2.0.so.0 + 0xbc717)
                #11 0x000074f3b7014f77 g_main_loop_run (libglib-2.0.so.0 + 0x5df77)
                #12 0x000074f3757feb45 gtk_main (libgtk-3.so.0 + 0x1feb45)
                #13 0x000074f3b81acb16 n/a (libffi.so.8 + 0x7b16)
                #14 0x000074f3b81a93ef n/a (libffi.so.8 + 0x43ef)
                #15 0x000074f3b81ac0be ffi_call (libffi.so.8 + 0x70be)
                #16 0x000074f3b774fbcb n/a (_gi.cpython-312-x86_64-linux-gnu.so + 0x30bcb)
                #17 0x000074f3b774e11a n/a (_gi.cpython-312-x86_64-linux-gnu.so + 0x2f11a)
                #18 0x000000000054b0dc PyObject_Call (python3.12 + 0x14b0dc)
                #19 0x00000000005db593 _PyEval_EvalFrameDefault (python3.12 + 0x1db593)
                #20 0x00000000005d59ab PyEval_EvalCode (python3.12 + 0x1d59ab)
                #21 0x0000000000608ac2 n/a (python3.12 + 0x208ac2)
                #22 0x00000000006b4d83 n/a (python3.12 + 0x2b4d83)
                #23 0x00000000006b4aea _PyRun_SimpleFileObject (python3.12 + 0x2b4aea)
                #24 0x00000000006b491f _PyRun_AnyFileObject (python3.12 + 0x2b491f)
                #25 0x00000000006bc9c5 Py_RunMain (python3.12 + 0x2bc9c5)
                #26 0x00000000006bc4ad Py_BytesMain (python3.12 + 0x2bc4ad)
                #27 0x000074f3b822a1ca __libc_start_call_main (libc.so.6 + 0x2a1ca)
                #28 0x000074f3b822a28b __libc_start_main_impl (libc.so.6 + 0x2a28b)
                #29 0x0000000000657925 _start (python3.12 + 0x257925)
                
                Stack trace of thread 4934:
                #0  0x000074f3b5d9b39a n/a (libgomp.so.1 + 0x2439a)
                #1  0x000074f3b5e90d8b n/a (_mypaintlib.cpython-312-x86_64-linux-gnu.so + 0x27d8b)
                #2  0x000074f3b5e44f3e process_tile_internal (libmypaint-1.5.so.1 + 0x14f3e)
                #3  0x000074f3b5e4547b n/a (libmypaint-1.5.so.1 + 0x1547b)
                #4  0x000074f3b5d98cde n/a (libgomp.so.1 + 0x21cde)
                #5  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #6  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4936:
                #0  0x000074f3b5d9b39e n/a (libgomp.so.1 + 0x2439e)
                #1  0x000074f3b5e90d8b n/a (_mypaintlib.cpython-312-x86_64-linux-gnu.so + 0x27d8b)
                #2  0x000074f3b5e44f3e process_tile_internal (libmypaint-1.5.so.1 + 0x14f3e)
                #3  0x000074f3b5e4547b n/a (libmypaint-1.5.so.1 + 0x1547b)
                #4  0x000074f3b5d98cde n/a (libgomp.so.1 + 0x21cde)
                #5  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #6  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4937:
                #0  0x000074f3b5d9bc6a n/a (libgomp.so.1 + 0x24c6a)
                #1  0x000074f3b5d98cea n/a (libgomp.so.1 + 0x21cea)
                #2  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #3  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4938:
                #0  0x000074f3b5d9bc6a n/a (libgomp.so.1 + 0x24c6a)
                #1  0x000074f3b5d98cea n/a (libgomp.so.1 + 0x21cea)
                #2  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #3  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4939:
                #0  0x000074f3b5d9bc6a n/a (libgomp.so.1 + 0x24c6a)
                #1  0x000074f3b5d98cea n/a (libgomp.so.1 + 0x21cea)
                #2  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #3  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4940:
                #0  0x000074f3b5d9bc6a n/a (libgomp.so.1 + 0x24c6a)
                #1  0x000074f3b5d98cea n/a (libgomp.so.1 + 0x21cea)
                #2  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #3  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4921:
                #0  0x000074f3b8298d61 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d61)
                #1  0x000074f3b829b7dd __pthread_cond_wait_common (libc.so.6 + 0x9b7dd)
                #2  0x000074f3b339cafb n/a (libopenblas.so.0 + 0x39cafb)
                #3  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #4  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4922:
                #0  0x000074f3b8298d61 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d61)
                #1  0x000074f3b829b7dd __pthread_cond_wait_common (libc.so.6 + 0x9b7dd)
                #2  0x000074f3b339cafb n/a (libopenblas.so.0 + 0x39cafb)
                #3  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #4  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4920:
                #0  0x000074f3b8298d61 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d61)
                #1  0x000074f3b829b7dd __pthread_cond_wait_common (libc.so.6 + 0x9b7dd)
                #2  0x000074f3b339cafb n/a (libopenblas.so.0 + 0x39cafb)
                #3  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #4  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4924:
                #0  0x000074f3b8298d61 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d61)
                #1  0x000074f3b829b7dd __pthread_cond_wait_common (libc.so.6 + 0x9b7dd)
                #2  0x000074f3b339cafb n/a (libopenblas.so.0 + 0x39cafb)
                #3  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #4  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4918:
                #0  0x000074f3b8298d61 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d61)
                #1  0x000074f3b829b7dd __pthread_cond_wait_common (libc.so.6 + 0x9b7dd)
                #2  0x000074f3b339cafb n/a (libopenblas.so.0 + 0x39cafb)
                #3  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #4  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4919:
                #0  0x000074f3b8298d61 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d61)
                #1  0x000074f3b829b7dd __pthread_cond_wait_common (libc.so.6 + 0x9b7dd)
                #2  0x000074f3b339cafb n/a (libopenblas.so.0 + 0x39cafb)
                #3  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #4  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4923:
                #0  0x000074f3b8298d61 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d61)
                #1  0x000074f3b829b7dd __pthread_cond_wait_common (libc.so.6 + 0x9b7dd)
                #2  0x000074f3b339cafb n/a (libopenblas.so.0 + 0x39cafb)
                #3  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #4  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4928:
                #0  0x000074f3b831b4cd __GI___poll (libc.so.6 + 0x11b4cd)
                #1  0x000074f3b707366e n/a (libglib-2.0.so.0 + 0xbc66e)
                #2  0x000074f3b7013a53 g_main_context_iteration (libglib-2.0.so.0 + 0x5ca53)
                #3  0x000074f3b2023595 n/a (libdconfsettings.so + 0x7595)
                #4  0x000074f3b7042c82 n/a (libglib-2.0.so.0 + 0x8bc82)
                #5  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #6  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4927:
                #0  0x000074f3b831b4cd __GI___poll (libc.so.6 + 0x11b4cd)
                #1  0x000074f3b707366e n/a (libglib-2.0.so.0 + 0xbc66e)
                #2  0x000074f3b7014f77 g_main_loop_run (libglib-2.0.so.0 + 0x5df77)
                #3  0x000074f3b6647422 n/a (libgio-2.0.so.0 + 0x11a422)
                #4  0x000074f3b7042c82 n/a (libglib-2.0.so.0 + 0x8bc82)
                #5  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #6  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4925:
                #0  0x000074f3b832725d syscall (libc.so.6 + 0x12725d)
                #1  0x000074f3b706d40d g_cond_wait (libglib-2.0.so.0 + 0xb640d)
                #2  0x000074f3b6fde52b n/a (libglib-2.0.so.0 + 0x2752b)
                #3  0x000074f3b7046043 n/a (libglib-2.0.so.0 + 0x8f043)
                #4  0x000074f3b7042c82 n/a (libglib-2.0.so.0 + 0x8bc82)
                #5  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #6  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4929:
                #0  0x000074f3b832725d syscall (libc.so.6 + 0x12725d)
                #1  0x000074f3b706dd00 g_cond_wait_until (libglib-2.0.so.0 + 0xb6d00)
                #2  0x000074f3b6fde4f3 n/a (libglib-2.0.so.0 + 0x274f3)
                #3  0x000074f3b6fde646 g_async_queue_timeout_pop (libglib-2.0.so.0 + 0x27646)
                #4  0x000074f3b70483df n/a (libglib-2.0.so.0 + 0x913df)
                #5  0x000074f3b7042c82 n/a (libglib-2.0.so.0 + 0x8bc82)
                #6  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #7  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4930:
                #0  0x000074f3b832725d syscall (libc.so.6 + 0x12725d)
                #1  0x000074f3b706d40d g_cond_wait (libglib-2.0.so.0 + 0xb640d)
                #2  0x000074f3b6fde52b n/a (libglib-2.0.so.0 + 0x2752b)
                #3  0x000074f3b6fde58c g_async_queue_pop (libglib-2.0.so.0 + 0x2758c)
                #4  0x000074f3b5f130fb n/a (libpangoft2-1.0.so.0 + 0xc0fb)
                #5  0x000074f3b7042c82 n/a (libglib-2.0.so.0 + 0x8bc82)
                #6  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #7  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4926:
                #0  0x000074f3b831b4cd __GI___poll (libc.so.6 + 0x11b4cd)
                #1  0x000074f3b707366e n/a (libglib-2.0.so.0 + 0xbc66e)
                #2  0x000074f3b7013a53 g_main_context_iteration (libglib-2.0.so.0 + 0x5ca53)
                #3  0x000074f3b7013aa9 n/a (libglib-2.0.so.0 + 0x5caa9)
                #4  0x000074f3b7042c82 n/a (libglib-2.0.so.0 + 0x8bc82)
                #5  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #6  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                
                Stack trace of thread 4931:
                #0  0x000074f3b831b4cd __GI___poll (libc.so.6 + 0x11b4cd)
                #1  0x000074f3714e3566 n/a (libpulse.so.0 + 0x34566)
                #2  0x000074f3714cc6c4 pa_mainloop_poll (libpulse.so.0 + 0x1d6c4)
                #3  0x000074f3714d7193 pa_mainloop_iterate (libpulse.so.0 + 0x28193)
                #4  0x000074f3714d7258 pa_mainloop_run (libpulse.so.0 + 0x28258)
                #5  0x000074f3714e7771 n/a (libpulse.so.0 + 0x38771)
                #6  0x000074f37148c3eb n/a (libpulsecommon-16.1.so + 0x5b3eb)
                #7  0x000074f3b829ca94 start_thread (libc.so.6 + 0x9ca94)
                #8  0x000074f3b8329c3c __clone3 (libc.so.6 + 0x129c3c)
                ELF object binary architecture: AMD x86-64

GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/python3.12...

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.ubuntu.com>
Enable debuginfod for this session? (y or [n]) y
Debuginfod has been enabled.
To make this setting permanent, add 'set debuginfod enabled on' to .gdbinit.
Reading symbols from /home/chrisl/.cache/debuginfod_client/d575bfe93b720eb1f8398b1c56ba864b3d9089bd/debuginfo...

warning: Can't open file /SYSV00000000 (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:pulseaudio (deleted) during file-backed mapping note processing
[New LWP 4935]
[New LWP 4917]
[New LWP 4934]
[New LWP 4936]
[New LWP 4937]
[New LWP 4938]
[New LWP 4939]
[New LWP 4940]
[New LWP 4921]
[New LWP 4922]
--Type <RET> for more, q to quit, c to continue without paging--c
[New LWP 4920]
[New LWP 4924]
[New LWP 4918]
[New LWP 4919]
[New LWP 4923]
[New LWP 4928]
[New LWP 4927]
[New LWP 4925]
[New LWP 4929]
[New LWP 4930]
[New LWP 4926]
[New LWP 4931]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/python3 /usr/bin/mypaint'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000000586be6 in _PyInterpreterState_GET () at ../Include/internal/**pycore_pystate**.h:133
133	    return tstate->interp;
[Current thread is 1 (Thread 0x74f3534006c0 (LWP 4935))]
(gdb) Quit

[jtojnar]

This looks like you skipped the third step of running bt full in the gdb prompt?

[gripfastistech]

@jtojnar apologzies, here is the output following bt full:

(gdb) bt full
#0  0x0000000000586be6 in _PyInterpreterState_GET () at ../Include/internal/pycore_pystate.h:133
        tstate = <optimized out>
        tstate = <optimized out>
#1  get_state () at ../Objects/obmalloc.c:866
        interp = <optimized out>
        interp = <optimized out>
#2  _PyObject_Malloc (nbytes=56, ctx=0x0) at ../Objects/obmalloc.c:1563
        state = <optimized out>
        ptr = <optimized out>
        state = <optimized out>
        ptr = <optimized out>
#3  PyObject_Malloc (size=56) at ../Objects/obmalloc.c:801
No locals.
#4  0x00000000005a6d02 in PyUnicode_New (maxchar=127, size=15) at ../Objects/unicodeobject.c:1251
        obj = <optimized out>
        unicode = <optimized out>
        data = <optimized out>
        kind = 1
        is_ascii = 1
        struct_size = 40
        char_size = 1
        obj = <optimized out>
        unicode = <optimized out>
        data = <optimized out>
        kind = <optimized out>
        is_ascii = <optimized out>
        char_size = <optimized out>
        struct_size = <optimized out>
#5  unicode_decode_utf8 (s=<optimized out>, size=15, error_handler=error_handler@entry=_Py_ERROR_UNKNOWN, 
    errors=errors@entry=0x0, consumed=consumed@entry=0x0) at ../Objects/unicodeobject.c:4693
        starts = 0x7c785a2492aa "_get_tile_numpy"
        end = 0x7c785a2492b9 ""
--Type <RET> for more, q to quit, c to continue without paging--c
        u = <optimized out>
        writer = {buffer = 0x0, data = 0x0, kind = 0, maxchar = 0, size = 0, pos = 0, min_length = 0, min_char = 0, 
          overallocate = 0 '\000', readonly = 0 '\000'}
        startinpos = 0
        endinpos = 0
        errmsg = <optimized out>
        error_handler_obj = 0x0
        exc = 0x0
#6  0x00000000005a6c79 in PyUnicode_DecodeUTF8Stateful (consumed=0x0, errors=0x0, size=<optimized out>, s=<optimized out>)
    at ../Objects/unicodeobject.c:4826
No locals.
#7  0x000000000058522e in PyObject_GetAttrString (v=0x7c78161917c0, name=<optimized out>) at ../Objects/object.c:918
        w = <optimized out>
        res = <optimized out>
#8  0x000000000054c02f in _PyObject_CallMethod_SizeT (obj=<optimized out>, name=<optimized out>, format=0x7c785a2492a4 "(iii)")
    at ../Objects/call.c:755
        tstate = 0x0
        callable = <optimized out>
        va = {{gp_offset = 3623878656, fp_offset = 31863, overflow_arg_area = 0x7c77f73fdba0, 
            reg_save_area = 0x7c785c4aa070 <alloc_new_heap+208>}}
        retval = <optimized out>
#9  0x00007c785a200db1 in tile_request_start (tiled_surface=0x3bf88f0, request=0x7c77f73fdce0) at lib/pythontiledsurface.cpp:41
        self = 0x3bf88f0
        readonly = 0
        tx = 3
        ty = 10
        rgba = 0x0
#10 0x00007c785a1cef3e in process_tile_internal (tiled_surface=tiled_surface@entry=0x3bf88f0, 
    request_start=request_start@entry=0x7c785a1c07a0 <tsf2_request_start>, 
    request_end=request_end@entry=0x7c785a1c07b0 <tsf2_request_end>, op_queue=0x3bf89c0, tx=3, ty=10)
    at /build/libmypaint-GnC0JG/libmypaint-1.6.0/mypaint-tiled-surface.c:512
        tile_index = {x = 3, y = <optimized out>}
        op = 0x43de0d0
        request_data = {tx = 3, ty = 10, readonly = 0, buffer = 0x0, context = 0x0, thread_id = 2, mipmap_level = 0}
        mipmap_level = 0
        rgba_p = <optimized out>
        mask = {0 <repeats 3364 times>, 3448, 23622, 31864, 0, 0, 0, 0, 0, 50089, 23644, 31864, 0, 64704, 63295, 31863, 0, 
          64912, 63295, 31863, 0, 64688, 63295, 31863, 0, 38004, 23622, 31864, 0, 0, 0, 0, 0, 65535, 65535, 65535, 65535, 0, 0, 
          0, 0, 50087, 23644, 31864, 0, 50064, 23644, 31864, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 117, 0, 0, 0, 0, 0, 64512, 63295, 
          31863, 0, 64628, 63295, 31863, 0, 0, 0, 0, 0, 4, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 32, 
          0 <repeats 39 times>, 24, 0, 48, 0, 65136, 63295, 31863, 0, 64944, 63295, 31863, 0 <repeats 507 times>, 13109, 14640, 
          18432, 64809, 57355, 47438, 0, 0, 0, 0, 64704, 63295, 31863, 0, 4096, 63168, 31863, 0, 65136, 63295, 31863, 0, 11, 0, 
          0, 0, 22752, 13370, 32766, 0, 64896, 63295, 31863, 0, 64721, 23624, 31864, 0, 65136, 63295, 31863, 0, 65163, 63295, 
          31863, 0, 65171, 63295, 31863, 0, 0, 0, 0, 0, 2, 0 <repeats 67 times>...}
#11 0x00007c785a1cf401 in tiled_surface2_process_tile (self=self@entry=0x3bf88f0, tx=<optimized out>, ty=<optimized out>)
    at /build/libmypaint-GnC0JG/libmypaint-1.6.0/mypaint-tiled-surface.c:892
No locals.
#12 0x00007c785a1cf47b in mypaint_tiled_surface2_end_atomic._omp_fn.0 ()
    at /build/libmypaint-GnC0JG/libmypaint-1.6.0/mypaint-tiled-surface.c:1156
        i = <optimized out>
        self = <optimized out>
        tiles = 0x4c2e580
        tiles_n = <optimized out>
#13 0x00007c785a122cde in gomp_thread_start (xdata=<optimized out>) at ../../../src/libgomp/team.c:129
        team = 0x3bf8a40
        task = 0x3bf9140
        data = <optimized out>
        thr = <optimized out>
        pool = 0x4abbff0
        local_fn = 0x7c785a1cf410 <mypaint_tiled_surface2_end_atomic._omp_fn.0>
        local_data = 0x7ffe343a5fe0
#14 0x00007c785c49ca94 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447
        ret = <optimized out>
        pd = <optimized out>
        out = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {136854691120832, -8291874265137444620, 136854691120832, -136, 11, 
                140729774659808, -8291874265091307276, -8290547859225474828}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 
              0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#15 0x00007c785c529c3c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
No locals.
(gdb) 

[gripfastistech]

Side note: Flatpak tested ok but flatpak sand-boxing (eg no external editing) is a deal breaker.

Today, I reinstalled the app image version after purging everything related to mypaint (apt, flatpack and appimage). With the appimage I was able to edit active ora files from mypaint externally using Gimp so I'm good for immediate use.

This is my working appimage info:

About:

2.0.1+git.478280f
(Python 2.7.5, GTK 3.22.30, GdkPixbuf 2.36.12, Cairo 1.15.12, GLib 2.56.1)

MD5: 46e2ad4217c783a87cb5387ca68308e1
SHA1: 95e0678013a93f6147bf1d9333dd041b1905ce8c
SHA256: 626cf82d7dc60195e5de872b673b958dd01aca0a6f5f399c8691a1ca5e2adc26
CRC32: 70c94aa0